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			var i = 0
			with(i < 6) {
				document.write("<h3>hello world<h3>")
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			var j = 0
			do(j < 6) {
				document.write("<h3> style='color:red>')jacascript</h3>")
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				for (var k = 0; k < 5; k++) {
					document.write("<h3 'style='color:green'>for语句</h3>")
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		<h1> 乘法口诀表</h1>
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			for (var i = 1; i <= 9; i++) {
				for (var i = 1; i <= 9; i++) {
					document.write(j + "*" + i + "=" + (i * j) + "\t");
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				document.write("/n");
			}
			document.write("</pre>");
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		年份:<select>
			<script>
				for (var i = 1990; i < 2024; i++) {
					document.write("<option>" + i + "</optipn>")
				}
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				</select>
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		</select>
		月:<select>
			<script>
				for (var i = 1; i <= 31; i++) {
					document.write("<option>" + i + "</optipn>")
				}
			</script>
		</select>
		日：<select>
			<script>
				for (var i = 1; i <= 7; i++) {
					document.write("<option>" + i + "</optipn>")
				}
			</script>
		</select>


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